Note 4 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

		June 30, 2025							December 31, 2024
	Fair Value Level1	Adjusted Cost		Gross Unrealized Losses			Fair Value		Adjusted Cost		Gross Unrealized Losses			Fair Value
Money market funds	Level 1	$	1,951	$	—		$	1,951	$	2,092	$	—		$	2,092
Municipal debt securities	Level 2		6,797		(1	)		6,796		3,458		—			3,458
Corporate debt securities	Level 2		18,328		(17	)		18,311		30,491		(26	)		30,465
Total investments		$	27,076	$	(18	)	$	27,058	$	36,041	$	(26	)	$	36,015